add test_workdir directory with dummy file
add test_workdir directory with dummy file

WillCh/cs286A,WillCh/286proj,richardliaw/cs286A,richardliaw/cs286A,WillCh/286proj,WillCh/cs286A,WillCh/cs286A,richardliaw/cs286A,richardliaw/cs286A,richardliaw/cs286A,WillCh/286proj,WillCh/cs286A,WillCh/286proj,richardliaw/cs286A,WillCh/286proj,WillCh/cs286A,WillCh/286proj,WillCh/cs286A